Magnet assembly for loudspeakers

Details Magnet assembly for loudspeakers Magnet assembly for loudspeakers

2007-03-27

2007-03-27

Le, Huyen (Department: 2615)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S412000, C381S414000, C381S421000

Reexamination Certificate

active

10531082

ABSTRACT:
A magnet assembly having inner and outer yokes of magnetic flux conductive material which together define an annular air gap and a radially oriented magnet sandwiched between the inner and outer yokes such that a first face of a first magnetic polarity contacts the inner yoke and a second face of a second opposite magnetic polarity contacts the outer yoke, characterised by an axially oriented magnet forming part of the magnet assembly, and wherein the radially oriented magnet is annular and has opposed axial ends, and the inner and outer yokes are annular and together enclose one axial end of radially oriented magnet to define the air gap, and wherein the axially oriented magnet is disposed adjacent to the other axial end of the radially oriented magnet, whereby the inner and outer yokes and the axially oriented magnet together reduce flux leakage from the magnet assembly. From other aspects the invention is a moving coil actuator comprising the magnet assembly described above or a loudspeaker incorporating the actuator.

REFERENCES:
patent: 3129298 (1964-04-01), Hofman
patent: 3549830 (1970-12-01), Hofman
patent: 4295011 (1981-10-01), Hathaway
patent: 5434458 (1995-07-01), Stuart et al.
patent: 5835612 (1998-11-01), Fujihira et al.
patent: 6020805 (2000-02-01), Borja
patent: 0 921 707 (1999-06-01), None
patent: 543716 (1942-03-01), None
patent: 52-72216 (1977-06-01), None
patent: 711704 (1974-02-01), None
patent: WO 93/03586 (1993-02-01), None

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